New natural gas infrastructure

José M. Osorio, Chicago Tribune

Workers work on installing a new 18 inch valve medium pressure header main on the 5200 block of W. Grace in Chicago. People's Gas is undergoing a massive underground overhaul of its residential natural gas pipe system.

Workers work on installing a new 18 inch valve medium pressure header main on the 5200 block of W. Grace in Chicago. People's Gas is undergoing a massive underground overhaul of its residential natural gas pipe system. (José M. Osorio, Chicago Tribune)

Workers work on installing a new 18 inch valve medium pressure header main on the 5200 block of W. Grace in Chicago. People's Gas is undergoing a massive underground overhaul of its residential natural gas pipe system.